docs: def auth_user_id(self, value):
          """The auth_user_id property.
          
          Args:
              value (string). the property value.
          """
          if value == self._defaults['ai.user.authUserId'] and 'ai.user.authUserId' in self._values:
              del self._values['ai.user.authUserId']
          else:
              self._values['ai.user.authUserId'] = value